<?php $this->placeholder('navigation')->captureStart() ?>
    <ul>
      <li class="nav active" id=""><a href="index.html">Trang Chủ</a></li>
      <li class="nav"><a href="GioiThieu.html">Giới Thiệu</a></li>
      <li class="nav"><a href="SanPham.html">Sản Phẩm</a></li>
      <li class="nav"><a href="#">Liên Hệ</a></li>
    </ul>
<?php $this->placeholder('navigation')->captureEnd() ?>